+;;; The :full-call assembly-routines must use the same full-call
+;;; unknown-values return convention as a normal call, as some
+;;; of the routines will tail-chain to a static-function. The
+;;; routines themselves, however, take all of their arguments
+;;; in registers (this will typically be one or two arguments,
+;;; and is one of the lower bounds on the number of argument-
+;;; passing registers), and thus don't need a call frame, which
+;;; simplifies things for the normal call/return case. When it
+;;; is neccessary for one of the assembly-functions to call a
+;;; static-function it will construct the required call frame.
+;;; Also, none of the assembly-routines return other than one
+;;; value, which again simplifies the return path.
+;;; -- AB, 2006/Feb/05.
+